Quantum's LTO-4 HH tape drive is a half-height tape drive that offers the same performance and reliability as competitors? full-height LTO-4 tape drives. At the same time, Quantum?s LTO-4 HH is the smart choice for those looking to reduce power consumption and cooling costs in the data center because it uses up to 46% less power when idle and up to 26% less power in standby than other LTO-4 drives on the market*. In addition, it uses less power when reading and writing than LTO-3 drives, while performing 50% faster.